Dusting attachment for printing presses known as an offset machine



Jan. 1, 1935.

DUSTING ATTACHMENT FOR P J. R. DAWLEY ET AL 1,986,047 RINTING PRESSES KNOWN AS AN OFFSET MACHINE Filed Sept. 10, 1930 5 Sheets -Sheet l Jan. 1, 1935.

J. R. DAWL EY ET AL 1,986,047 DUSTING ATTACHMENT FOR PRINTING PRESSES KNOWN AS AN OFFSET MACHINE Filed Sept. 10, 1930 3 Sheets-Shegt 2 Jan. 1, 1935.

J. R. DAWLEY ET'AL DUSTING ATTACHMENT FOR PRINTING PRESSES KNOWN AS AN OFFSET MACHINE Filed Sept. 10, 1930 Z 'g. 5.

3 Sheets-Sheet 3 I8 I 21 l9 g IT l I W" 1 f 1' 1' TWV'A A AWTM Patented Jan. 1, 1935 1 ,DUSTING"; ,ATTKCHMENTii EORQlfltiNTING 1:

' PBES.SES KNOWN as AN OFESETMAGHINE I 'Raymond DawIey, Cleveland, and Danie l Y l Lamar Gregar,

Avon Village, Ohio applicatioalsebtater 10, 1930, Serial N 450,994 g other when stacked ary practice.

The objects rangements, by means of in a pile as is the customof the present invention are to for printing presses constructions and arwhich the device is operated by the press delivery mechanism in conjunction therewith, delivers a proper amount of dust to the printed sheet after delivery, and

does not overdust the sheets.

The invention consists tions, arrangements in the novel construcand combinations of parts hereinafter more particularly described and claimed.

Three sheets of specification as part ence characters indicate Fig. l is a perspe device attached Fig. 2 is a vertic through the dusting drawings accompany this thereof, in which like referlike parts throughout. ctive showing the improved to the delivery end of a press.

al, transverse cross section device.

Fig. 8 is a longitudinal vertical cross section taken on line 3-3 of Fig. 2.

Fig. 4 is a longitudinal vertical cross section taken on line 4-4 of Fig. 2.

Fig. 5 is a plan view partly broken away with parts in cross section illustrating the clutch control.

Fig. 6 is a detail plan of the clutch connection.

Fig. 7 is an end elevation of thedevice.

In the drawings, 1

bers of the press delivery upon slidably ing device is represents side frame memwhich the dustmounted, 2 indicates frame member'of the press delivery, and 3 indicates printed sheets delivered from the press.

The improved sifting or dusting device comprises a container 5 tend substantially the hinged top 6 pivoted as at '7, a through which the powder to be dusted onto the deposited into the container.

and having a printed sheets is of a length adapted to exwidth of the press delivery On the under-face of the lid 6 and adjacent its free edge is positioned contact a cylinder 1 the container and The bottom 1''! of means of set screws a wiper 15, adapted to 2 mounted longitudinally of forming one wall, thereof." the container is adjustable by I 18, so as to adjust the clearance between the bottom 1'7 and cylinder 12. A brush 16 is mounted on the container exterior of cylinder 12, and

this brush extends entirely disengage the clutch face of the cylinder 5 claims. (01. 91- 59 rocking of shaft 11 in connection with the press delivery mechanism operates to advance and retract container 5 over the pile of printed sheets 3 in the press delivery.

For the purpose of rotating cylinder 12, the same is mounted on a shaft 13 suitably journaled in the ends of container 5 as by means of 15 bearings 14, and on shaft 13 are mounted clutch elements 18 and20. Clutch element 18 is caused to rotate with shaft 13 by means of key 19 but is slidable on the shaft. Clutch element 20 is fixedly secured to a gear 21 freely rotatable on 20 the shaft 13.v The adjacent faces of the clutch elements 18 and 20 are provided with bevelled teeth 23, so that rotation of the gear 20 in a counter-clockwise direction will automatically elements. To positively engage the'clutch elements, a groove 22 is formed in clutch member 18 and at one end of the press delivery is mounted a cam member 25 having a bevelled face 26 adapted to enter groove 22 and slide clutch member 18 on shaft 13 into engage- 30 ment with clutch member 20. The gear 21 is in constant engagement with a rack 24 mounted on a suitable frame member of the press parallel with frame member 1.

In operation, as the press delivery delivers a printed sheet towards pile 3, container 5 is advanced with the sheet to the front end of the delivery. The clutch members during this mo-i i tion being disengaged by reason of the bevelled teeth over-riding each other. end of the press cam member 25 enters slot 22, thus engaging the clutch members, and as the press delivery returns to the press cylinder for the next sheet, container 6 is retracted therewith, cylinder 12 indicated by the arrows by means of gear 21 and the clutch mechanism described, the surface'of the cylinder 12 carrying powder from within the container, which powder is swept from the sur evenly over the printed sheet just deposited upon 'pile 3. 1 a Obviously the operation will be repeated automatically with the deposit of each newly printed sheet. v 55 At the forward 40- being rotated in the direction by brush 1e and distributed to Various modifications in the precise structure will readily suggest themselves to those skilled in the art but within the scope of the present invention as claimed. v

Having thus fully described our invention, We claim:

1. In a press having means for delivering printed sheets and a frame, means associated with the sheet delivering means and-reciprocable of the frame over the delivered sheets, including a hopper, a sifting device hopper for sifting powder 3. The structure of claim 1 in which the.hop-. per has an adjustable bottom walland the siftassociated with thetherefrom onto the sheets, and means operable by 'thereciprocation of the device to operate thesi fting device during for brushing dust ing device includes a cylinder associated with the hopper to constitute a side wall thereof adjacent the said adjustable wall whereby an adjustable outlet is provided between the cylinder and said wall.

4. The structure of claim 1 in which the sifting device includes a shaft and a cylinder mounted thereon, a gear on the shaft, a rack carried bythe frame with which the gear engages, clutch means on the shaft and gear, and

means on the frame for operating the clutch 5. The'structureof claim 1 in which the sifting deviceiiicludes-a shaft and a cylinder r nountedjthereon, a gear rotatably mounted on 'the shaftQa raCk'carried by the frame with which the gear engages, an over-riding clutch .on

the shaft and gear, and means on the frame for ,operating the clutch to secure the gear to the shaft.

' a, JAMES RAYMOND DAWLEY.

w DANIEL LAMARZ-CREGAR. 

